Carburetor-choke-valve spring



' 1,627,220 May 3 1927 F. G. wxTHRow l CAR-BURETOR CHOKE VALVE SPRING Filed Aug. 10. 1925.

Patente-d `May 3, 1927.'-

UNITED STATES PATENT OFFICE' l `FLOYD e. w-ITHRowQoF GRANDRABIDS, MICHIGAN.-

CAnBUnEToR-'cnoxnfvALvn SPRING.

Application mea August 10,"1925, serial No.49,496."

The invention provides various novel features of construction and arrangement which will hereinafter be more fully de scribed and particularly pointed out in the claim, reference being had to the accompanying drawing, in which,

Fig. 1 is an elevation of a carburetor having a choke valve spring embodying this invention applied in operative position thereto. Y

Fig. 2 is a fragmentaryv section showing the choke valve in its normal position.

Fig. 3 is a perspective view of the spring removed from the carburetor, and

Fig. 4 is a fragmentary view illustrating the construction at one` end of the said spring. p

Like numbers refer to like parts in the different figures of the drawing.

The carburetor for which this choke valve spring is especially adapted is ofthe type commonly used in Ford automobiles and it comprises a body portion 1 having an air inlet 2 and a gas outlet 3 disposed diametrically' opposite. A fioat chamber 4 is located beneath the body and a gasoline inlet 5 enters one side of the body near its'center.

` At the air inlet 2 the customary choke valve 6 of the butterfiy type is provided which is mounted upon a shaft v6a and the. bell crank lever 7 fixed to the `shaft 6iL i provided for manipulating the choke valve.

The lever 7 has a hub 8 projecting from its outer surface and surrounding the shaft 6:" and it also has stop lugs 9 and 10 which engage the pin 11 on the carburetor body to limit the movement of the lever and consequently the valve in either direction. A pull rod 12 is `connected to one arm of the bell crank lever 7 and extends upwardly and may be manually operated to close the choke valve.

the outlet 3 of the carburetor a flange' 13 is provided on the body which engages a similarly shaped flange 14 on the intake manifold 15 and cap screws 16 extend through the iange 13 and are threaded into the flange 14 to connect the carburetor to the manifold.

During normal operation of the engine the choke valve should remain in wide open position, in which position the lug'9 on the bell crank lever engages the stop pin 11 and is the object of the spring embodying this Y invention to yieldably retain the choke valve in this open position. When it is desired to enrich the mixture of the gasoline and air fed to theengine, which is customarily done lfor a short period in starting the engine and Valso for short periods under some other corr ditions, the pull rod 12 is manually operated to rotate the shaft 6a and either wholly or partially close fthe choke valve 6 but when the pull rod 12 is released itis desirable to have the choke valve automatically return to wide open position;

The spring which I have invented comprises a single piece of Wire formed into a spring'coil v17 substantially midway between the ends of the wire from which two end portions 18 and 19 extend downwardly and away from each other. The portion 19 terminates in a hookv 20, while the portion 18 is bent into an eye 21, thence extendedfor a short distance and turned at right angles making a short section 22 `which is again turned at right Iangles to make the terminal section 23. Y A

In applying this springto the carburetor the hook 20 is hooked over `the pin 11 and the parts 1S and 19 sprung toward each other, the bent end including sections 22 and 23 passing through an opening in the" end of the arm 7 a of the bell crank lever. To the eye 21 a wire 24 may be connected and extend forwardlyto and through the radia-` '100 tor of the automobile so that the choke may be operated while the engine is being' cranked. v p

. It will be seen that this device is an extremely simple part made from a single piece of spring wire and so shaped that it may be installed by simply fitting itV int-o place, this being a practically instantaneous operation. When in operative position the springv exerts a constant downward pressure against the arm 7 a ofthe bell crank' lever 7 with which it is hooked and yieldably holds the lug 9 against the .Step 1l. When the bell crank lever is movedto close thevalve-the spring Will flex and will return the Valve hook formed at one end of vo ne of saidendl Vcireetion as AsaidY end portions, an eye formed adjacent the end of the opposite end portion the Wirel being then bent laterally for a vdistance at right angles and then Vagain at Vright Yangles in the same portions, substantially as described. y.

In testimony whereof I affix my signature.

FLOYD G. WITHROW. 

